An Immigration and Customs Enforcement agent who won a government award in 2007 for his "outstanding debriefs" of suspicious airline passengers is suing the chief of Homeland Security.

Sunil Walia is seeking $2.5 million in damages, claiming he was transferred from his role interviewing suspicious travelers at JFK Airport and reassigned to an administrative job after he filed two discrimination complaints against Janet Napolitano, The New York Post reported Tuesday.

Walia says the transfer cost him his shot at working for the Joint Terrorism Task force because agents have to be in their current assignment for at least two years before they can apply for the elite post.

Walia's suit isn't the first to be filed against Napolitano. In August, it was reported the number of non-sexual harassment claims filed against ICE jumped by 44 percent in two years.

In one suit, James Hayes — a top federal immigration official — claimed ICE's Washington office had a "frat-house" atmosphere, alleging Napolitano's chief of staff moved the contents of three male employees' offices into the men's bathroom.